1 //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to PowerPC assembly language. This printer is
12 // the output mechanism used by `llc'.
14 // Documentation at http://developer.apple.com/documentation/DeveloperTools/
15 // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
17 //===----------------------------------------------------------------------===//
20 #include "InstPrinter/PPCInstPrinter.h"
21 #include "MCTargetDesc/PPCMCExpr.h"
22 #include "MCTargetDesc/PPCPredicates.h"
23 #include "PPCSubtarget.h"
24 #include "PPCTargetMachine.h"
25 #include "PPCTargetStreamer.h"
26 #include "llvm/ADT/MapVector.h"
27 #include "llvm/ADT/SmallString.h"
28 #include "llvm/ADT/StringExtras.h"
29 #include "llvm/CodeGen/AsmPrinter.h"
30 #include "llvm/CodeGen/MachineFunctionPass.h"
31 #include "llvm/CodeGen/MachineInstr.h"
32 #include "llvm/CodeGen/MachineInstrBuilder.h"
33 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
34 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
35 #include "llvm/IR/Constants.h"
36 #include "llvm/IR/DebugInfo.h"
37 #include "llvm/IR/DerivedTypes.h"
38 #include "llvm/IR/Mangler.h"
39 #include "llvm/IR/Module.h"
40 #include "llvm/MC/MCAsmInfo.h"
41 #include "llvm/MC/MCContext.h"
42 #include "llvm/MC/MCExpr.h"
43 #include "llvm/MC/MCInst.h"
44 #include "llvm/MC/MCInstBuilder.h"
45 #include "llvm/MC/MCSectionELF.h"
46 #include "llvm/MC/MCSectionMachO.h"
47 #include "llvm/MC/MCStreamer.h"
48 #include "llvm/MC/MCSymbol.h"
49 #include "llvm/Support/CommandLine.h"
50 #include "llvm/Support/Debug.h"
51 #include "llvm/Support/ELF.h"
52 #include "llvm/Support/ErrorHandling.h"
53 #include "llvm/Support/MathExtras.h"
54 #include "llvm/Support/TargetRegistry.h"
55 #include "llvm/Support/raw_ostream.h"
56 #include "llvm/Target/TargetInstrInfo.h"
57 #include "llvm/Target/TargetOptions.h"
58 #include "llvm/Target/TargetRegisterInfo.h"
61 #define DEBUG_TYPE "asmprinter"
64 class PPCAsmPrinter : public AsmPrinter {
66 MapVector<MCSymbol*, MCSymbol*> TOC;
67 const PPCSubtarget &Subtarget;
70 explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
71 : AsmPrinter(TM, Streamer),
72 Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
74 const char *getPassName() const override {
75 return "PowerPC Assembly Printer";
78 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
80 void EmitInstruction(const MachineInstr *MI) override;
82 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
84 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
85 unsigned AsmVariant, const char *ExtraCode,
86 raw_ostream &O) override;
87 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
88 unsigned AsmVariant, const char *ExtraCode,
89 raw_ostream &O) override;
92 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
93 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
95 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
96 : PPCAsmPrinter(TM, Streamer) {}
98 const char *getPassName() const override {
99 return "Linux PPC Assembly Printer";
102 bool doFinalization(Module &M) override;
104 void EmitFunctionEntryLabel() override;
106 void EmitFunctionBodyEnd() override;
109 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
111 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
113 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
114 : PPCAsmPrinter(TM, Streamer) {}
116 const char *getPassName() const override {
117 return "Darwin PPC Assembly Printer";
120 bool doFinalization(Module &M) override;
121 void EmitStartOfAsmFile(Module &M) override;
123 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
125 } // end of anonymous namespace
127 /// stripRegisterPrefix - This method strips the character prefix from a
128 /// register name so that only the number is left. Used by for linux asm.
129 static const char *stripRegisterPrefix(const char *RegName) {
130 switch (RegName[0]) {
134 if (RegName[1] == 's')
137 case 'c': if (RegName[1] == 'r') return RegName + 2;
143 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
145 const DataLayout *DL = TM.getDataLayout();
146 const MachineOperand &MO = MI->getOperand(OpNo);
148 switch (MO.getType()) {
149 case MachineOperand::MO_Register: {
150 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
151 // Linux assembler (Others?) does not take register mnemonics.
152 // FIXME - What about special registers used in mfspr/mtspr?
153 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
157 case MachineOperand::MO_Immediate:
161 case MachineOperand::MO_MachineBasicBlock:
162 O << *MO.getMBB()->getSymbol();
164 case MachineOperand::MO_ConstantPoolIndex:
165 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
166 << '_' << MO.getIndex();
168 case MachineOperand::MO_BlockAddress:
169 O << *GetBlockAddressSymbol(MO.getBlockAddress());
171 case MachineOperand::MO_GlobalAddress: {
172 // Computing the address of a global symbol, not calling it.
173 const GlobalValue *GV = MO.getGlobal();
174 MCSymbol *SymToPrint;
176 // External or weakly linked global variables need non-lazily-resolved stubs
177 if (TM.getRelocationModel() != Reloc::Static &&
178 (GV->isDeclaration() || GV->isWeakForLinker())) {
179 if (!GV->hasHiddenVisibility()) {
180 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
181 MachineModuleInfoImpl::StubValueTy &StubSym =
182 MMI->getObjFileInfo<MachineModuleInfoMachO>()
183 .getGVStubEntry(SymToPrint);
184 if (!StubSym.getPointer())
185 StubSym = MachineModuleInfoImpl::
186 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
187 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
188 GV->hasAvailableExternallyLinkage()) {
189 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
191 MachineModuleInfoImpl::StubValueTy &StubSym =
192 MMI->getObjFileInfo<MachineModuleInfoMachO>().
193 getHiddenGVStubEntry(SymToPrint);
194 if (!StubSym.getPointer())
195 StubSym = MachineModuleInfoImpl::
196 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
198 SymToPrint = getSymbol(GV);
201 SymToPrint = getSymbol(GV);
206 printOffset(MO.getOffset(), O);
211 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
216 /// PrintAsmOperand - Print out an operand for an inline asm expression.
218 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
220 const char *ExtraCode, raw_ostream &O) {
221 // Does this asm operand have a single letter operand modifier?
222 if (ExtraCode && ExtraCode[0]) {
223 if (ExtraCode[1] != 0) return true; // Unknown modifier.
225 switch (ExtraCode[0]) {
227 // See if this is a generic print operand
228 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
229 case 'c': // Don't print "$" before a global var name or constant.
230 break; // PPC never has a prefix.
231 case 'L': // Write second word of DImode reference.
232 // Verify that this operand has two consecutive registers.
233 if (!MI->getOperand(OpNo).isReg() ||
234 OpNo+1 == MI->getNumOperands() ||
235 !MI->getOperand(OpNo+1).isReg())
237 ++OpNo; // Return the high-part.
240 // Write 'i' if an integer constant, otherwise nothing. Used to print
242 if (MI->getOperand(OpNo).isImm())
248 printOperand(MI, OpNo, O);
252 // At the moment, all inline asm memory operands are a single register.
253 // In any case, the output of this routine should always be just one
254 // assembler operand.
256 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
258 const char *ExtraCode,
260 if (ExtraCode && ExtraCode[0]) {
261 if (ExtraCode[1] != 0) return true; // Unknown modifier.
263 switch (ExtraCode[0]) {
264 default: return true; // Unknown modifier.
265 case 'y': // A memory reference for an X-form instruction
267 const char *RegName = "r0";
268 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
269 O << RegName << ", ";
270 printOperand(MI, OpNo, O);
276 assert(MI->getOperand(OpNo).isReg());
278 printOperand(MI, OpNo, O);
284 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
285 /// exists for it. If not, create one. Then return a symbol that references
287 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
288 const DataLayout *DL = TM.getDataLayout();
289 MCSymbol *&TOCEntry = TOC[Sym];
291 // To avoid name clash check if the name already exists.
293 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
294 "C" + Twine(TOCLabelID++)) == nullptr) {
295 TOCEntry = GetTempSymbol("C", TOCLabelID);
303 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
304 /// the current output stream.
306 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
308 bool isPPC64 = Subtarget.isPPC64();
310 // Lower multi-instruction pseudo operations.
311 switch (MI->getOpcode()) {
313 case TargetOpcode::DBG_VALUE:
314 llvm_unreachable("Should be handled target independently");
315 case PPC::MovePCtoLR:
316 case PPC::MovePCtoLR8: {
317 // Transform %LR = MovePCtoLR
318 // Into this, where the label is the PIC base:
321 MCSymbol *PICBase = MF->getPICBaseSymbol();
324 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
325 // FIXME: We would like an efficient form for this, so we don't have to do
326 // a lot of extra uniquing.
327 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
330 OutStreamer.EmitLabel(PICBase);
336 // Transform %X3 = LDtoc <ga:@min1>, %X2
337 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
339 // Change the opcode to LD, and the global address operand to be a
340 // reference to the TOC entry we will synthesize later.
341 TmpInst.setOpcode(PPC::LD);
342 const MachineOperand &MO = MI->getOperand(1);
344 // Map symbol -> label of TOC entry
345 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
346 MCSymbol *MOSymbol = nullptr;
348 MOSymbol = getSymbol(MO.getGlobal());
350 MOSymbol = GetCPISymbol(MO.getIndex());
352 MOSymbol = GetJTISymbol(MO.getIndex());
354 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
357 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
359 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
360 EmitToStreamer(OutStreamer, TmpInst);
364 case PPC::ADDIStocHA: {
365 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
366 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
368 // Change the opcode to ADDIS8. If the global address is external,
369 // has common linkage, is a function address, or is a jump table
370 // address, then generate a TOC entry and reference that. Otherwise
371 // reference the symbol directly.
372 TmpInst.setOpcode(PPC::ADDIS8);
373 const MachineOperand &MO = MI->getOperand(2);
374 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI()) &&
375 "Invalid operand for ADDIStocHA!");
376 MCSymbol *MOSymbol = nullptr;
377 bool IsExternal = false;
378 bool IsFunction = false;
379 bool IsCommon = false;
380 bool IsAvailExt = false;
383 const GlobalValue *GV = MO.getGlobal();
384 MOSymbol = getSymbol(GV);
385 IsExternal = GV->isDeclaration();
386 IsCommon = GV->hasCommonLinkage();
387 IsFunction = GV->getType()->getElementType()->isFunctionTy();
388 IsAvailExt = GV->hasAvailableExternallyLinkage();
389 } else if (MO.isCPI())
390 MOSymbol = GetCPISymbol(MO.getIndex());
392 MOSymbol = GetJTISymbol(MO.getIndex());
394 if (IsExternal || IsFunction || IsCommon || IsAvailExt || MO.isJTI() ||
395 TM.getCodeModel() == CodeModel::Large)
396 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
399 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
401 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
402 EmitToStreamer(OutStreamer, TmpInst);
406 // Transform %Xd = LDtocL <ga:@sym>, %Xs
407 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
409 // Change the opcode to LD. If the global address is external, has
410 // common linkage, or is a jump table address, then reference the
411 // associated TOC entry. Otherwise reference the symbol directly.
412 TmpInst.setOpcode(PPC::LD);
413 const MachineOperand &MO = MI->getOperand(1);
414 assert((MO.isGlobal() || MO.isJTI() || MO.isCPI()) &&
415 "Invalid operand for LDtocL!");
416 MCSymbol *MOSymbol = nullptr;
419 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
420 else if (MO.isCPI()) {
421 MOSymbol = GetCPISymbol(MO.getIndex());
422 if (TM.getCodeModel() == CodeModel::Large)
423 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
425 else if (MO.isGlobal()) {
426 const GlobalValue *GValue = MO.getGlobal();
427 MOSymbol = getSymbol(GValue);
428 if (GValue->getType()->getElementType()->isFunctionTy() ||
429 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
430 GValue->hasAvailableExternallyLinkage() ||
431 TM.getCodeModel() == CodeModel::Large)
432 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
436 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
438 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
439 EmitToStreamer(OutStreamer, TmpInst);
442 case PPC::ADDItocL: {
443 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
444 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
446 // Change the opcode to ADDI8. If the global address is external, then
447 // generate a TOC entry and reference that. Otherwise reference the
449 TmpInst.setOpcode(PPC::ADDI8);
450 const MachineOperand &MO = MI->getOperand(2);
451 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
452 MCSymbol *MOSymbol = nullptr;
453 bool IsExternal = false;
454 bool IsFunction = false;
457 const GlobalValue *GV = MO.getGlobal();
458 MOSymbol = getSymbol(GV);
459 IsExternal = GV->isDeclaration();
460 IsFunction = GV->getType()->getElementType()->isFunctionTy();
461 } else if (MO.isCPI())
462 MOSymbol = GetCPISymbol(MO.getIndex());
464 if (IsFunction || IsExternal || TM.getCodeModel() == CodeModel::Large)
465 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
468 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
470 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
471 EmitToStreamer(OutStreamer, TmpInst);
474 case PPC::ADDISgotTprelHA: {
475 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
476 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
477 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
478 const MachineOperand &MO = MI->getOperand(2);
479 const GlobalValue *GValue = MO.getGlobal();
480 MCSymbol *MOSymbol = getSymbol(GValue);
481 const MCExpr *SymGotTprel =
482 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
484 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
485 .addReg(MI->getOperand(0).getReg())
487 .addExpr(SymGotTprel));
490 case PPC::LDgotTprelL:
491 case PPC::LDgotTprelL32: {
492 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
493 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
495 // Change the opcode to LD.
496 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
497 const MachineOperand &MO = MI->getOperand(1);
498 const GlobalValue *GValue = MO.getGlobal();
499 MCSymbol *MOSymbol = getSymbol(GValue);
501 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
503 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
504 EmitToStreamer(OutStreamer, TmpInst);
508 case PPC::PPC32GOT: {
509 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
510 const MCExpr *SymGotTlsL =
511 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
513 const MCExpr *SymGotTlsHA =
514 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
516 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
517 .addReg(MI->getOperand(0).getReg())
518 .addExpr(SymGotTlsL));
519 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
520 .addReg(MI->getOperand(0).getReg())
521 .addReg(MI->getOperand(0).getReg())
522 .addExpr(SymGotTlsHA));
525 case PPC::ADDIStlsgdHA: {
526 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
527 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
528 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
529 const MachineOperand &MO = MI->getOperand(2);
530 const GlobalValue *GValue = MO.getGlobal();
531 MCSymbol *MOSymbol = getSymbol(GValue);
532 const MCExpr *SymGotTlsGD =
533 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
535 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
536 .addReg(MI->getOperand(0).getReg())
538 .addExpr(SymGotTlsGD));
541 case PPC::ADDItlsgdL: {
542 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
543 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
544 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
545 const MachineOperand &MO = MI->getOperand(2);
546 const GlobalValue *GValue = MO.getGlobal();
547 MCSymbol *MOSymbol = getSymbol(GValue);
548 const MCExpr *SymGotTlsGD =
549 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO,
551 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI8)
552 .addReg(MI->getOperand(0).getReg())
553 .addReg(MI->getOperand(1).getReg())
554 .addExpr(SymGotTlsGD));
557 case PPC::GETtlsADDR: {
558 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
559 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsgd)
560 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
562 StringRef Name = "__tls_get_addr";
563 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
564 const MCSymbolRefExpr *TlsRef =
565 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
566 const MachineOperand &MO = MI->getOperand(2);
567 const GlobalValue *GValue = MO.getGlobal();
568 MCSymbol *MOSymbol = getSymbol(GValue);
569 const MCExpr *SymVar =
570 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSGD,
572 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL8_NOP_TLS)
577 case PPC::ADDIStlsldHA: {
578 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
579 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
580 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
581 const MachineOperand &MO = MI->getOperand(2);
582 const GlobalValue *GValue = MO.getGlobal();
583 MCSymbol *MOSymbol = getSymbol(GValue);
584 const MCExpr *SymGotTlsLD =
585 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
587 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
588 .addReg(MI->getOperand(0).getReg())
590 .addExpr(SymGotTlsLD));
593 case PPC::ADDItlsldL: {
594 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
595 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
596 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
597 const MachineOperand &MO = MI->getOperand(2);
598 const GlobalValue *GValue = MO.getGlobal();
599 MCSymbol *MOSymbol = getSymbol(GValue);
600 const MCExpr *SymGotTlsLD =
601 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO,
603 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI8)
604 .addReg(MI->getOperand(0).getReg())
605 .addReg(MI->getOperand(1).getReg())
606 .addExpr(SymGotTlsLD));
609 case PPC::GETtlsldADDR: {
610 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
611 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsld)
612 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
614 StringRef Name = "__tls_get_addr";
615 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
616 const MCSymbolRefExpr *TlsRef =
617 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
618 const MachineOperand &MO = MI->getOperand(2);
619 const GlobalValue *GValue = MO.getGlobal();
620 MCSymbol *MOSymbol = getSymbol(GValue);
621 const MCExpr *SymVar =
622 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD,
624 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL8_NOP_TLS)
629 case PPC::ADDISdtprelHA: {
630 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
631 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
632 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
633 const MachineOperand &MO = MI->getOperand(2);
634 const GlobalValue *GValue = MO.getGlobal();
635 MCSymbol *MOSymbol = getSymbol(GValue);
636 const MCExpr *SymDtprel =
637 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
639 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
640 .addReg(MI->getOperand(0).getReg())
642 .addExpr(SymDtprel));
645 case PPC::ADDIdtprelL: {
646 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
647 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
648 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
649 const MachineOperand &MO = MI->getOperand(2);
650 const GlobalValue *GValue = MO.getGlobal();
651 MCSymbol *MOSymbol = getSymbol(GValue);
652 const MCExpr *SymDtprel =
653 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
655 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI8)
656 .addReg(MI->getOperand(0).getReg())
657 .addReg(MI->getOperand(1).getReg())
658 .addExpr(SymDtprel));
663 if (!Subtarget.hasMFOCRF()) {
664 // Transform: %R3 = MFOCRF %CR7
665 // Into: %R3 = MFCR ;; cr7
667 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
668 OutStreamer.AddComment(PPCInstPrinter::
669 getRegisterName(MI->getOperand(1).getReg()));
670 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
671 .addReg(MI->getOperand(0).getReg()));
677 if (!Subtarget.hasMFOCRF()) {
678 // Transform: %CR7 = MTOCRF %R3
679 // Into: MTCRF mask, %R3 ;; cr7
681 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
682 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
683 ->getEncodingValue(MI->getOperand(0).getReg());
684 OutStreamer.AddComment(PPCInstPrinter::
685 getRegisterName(MI->getOperand(0).getReg()));
686 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
688 .addReg(MI->getOperand(1).getReg()));
696 // Verify alignment is legal, so we don't create relocations
697 // that can't be supported.
698 // FIXME: This test is currently disabled for Darwin. The test
699 // suite shows a handful of test cases that fail this check for
700 // Darwin. Those need to be investigated before this sanity test
701 // can be enabled for those subtargets.
702 if (!Subtarget.isDarwin()) {
703 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
704 const MachineOperand &MO = MI->getOperand(OpNum);
705 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
706 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
708 // Now process the instruction normally.
713 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
714 EmitToStreamer(OutStreamer, TmpInst);
717 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
718 if (!Subtarget.isPPC64()) // linux/ppc32 - Normal entry label.
719 return AsmPrinter::EmitFunctionEntryLabel();
721 // Emit an official procedure descriptor.
722 MCSectionSubPair Current = OutStreamer.getCurrentSection();
723 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
724 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
725 SectionKind::getReadOnly());
726 OutStreamer.SwitchSection(Section);
727 OutStreamer.EmitLabel(CurrentFnSym);
728 OutStreamer.EmitValueToAlignment(8);
730 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
731 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
733 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
735 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
736 // Generates a R_PPC64_TOC relocation for TOC base insertion.
737 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
738 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
740 // Emit a null environment pointer.
741 OutStreamer.EmitIntValue(0, 8 /* size */);
742 OutStreamer.SwitchSection(Current.first, Current.second);
744 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
745 ".L." + Twine(CurrentFnSym->getName()));
746 OutStreamer.EmitLabel(RealFnSym);
747 CurrentFnSymForSize = RealFnSym;
751 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
752 const DataLayout *TD = TM.getDataLayout();
754 bool isPPC64 = TD->getPointerSizeInBits() == 64;
756 PPCTargetStreamer &TS =
757 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
759 if (isPPC64 && !TOC.empty()) {
760 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
761 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
762 SectionKind::getReadOnly());
763 OutStreamer.SwitchSection(Section);
765 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
766 E = TOC.end(); I != E; ++I) {
767 OutStreamer.EmitLabel(I->second);
768 MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
773 MachineModuleInfoELF &MMIELF =
774 MMI->getObjFileInfo<MachineModuleInfoELF>();
776 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
777 if (!Stubs.empty()) {
778 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
779 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
781 OutStreamer.EmitLabel(Stubs[i].first);
783 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
785 isPPC64 ? 8 : 4/*size*/);
789 OutStreamer.AddBlankLine();
792 return AsmPrinter::doFinalization(M);
795 /// EmitFunctionBodyEnd - Print the traceback table before the .size
798 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
799 // Only the 64-bit target requires a traceback table. For now,
800 // we only emit the word of zeroes that GDB requires to find
801 // the end of the function, and zeroes for the eight-byte
803 // FIXME: We should fill in the eight-byte mandatory fields as described in
804 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
805 // currently make use of these fields).
806 if (Subtarget.isPPC64()) {
807 OutStreamer.EmitIntValue(0, 4/*size*/);
808 OutStreamer.EmitIntValue(0, 8/*size*/);
812 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
813 static const char *const CPUDirectives[] = {
837 unsigned Directive = Subtarget.getDarwinDirective();
838 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
839 Directive = PPC::DIR_970;
840 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
841 Directive = PPC::DIR_7400;
842 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
843 Directive = PPC::DIR_64;
844 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
846 assert(Directive < array_lengthof(CPUDirectives) &&
847 "CPUDirectives[] might not be up-to-date!");
848 PPCTargetStreamer &TStreamer =
849 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
850 TStreamer.emitMachine(CPUDirectives[Directive]);
852 // Prime text sections so they are adjacent. This reduces the likelihood a
853 // large data or debug section causes a branch to exceed 16M limit.
854 const TargetLoweringObjectFileMachO &TLOFMacho =
855 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
856 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
857 if (TM.getRelocationModel() == Reloc::PIC_) {
858 OutStreamer.SwitchSection(
859 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
860 MachO::S_SYMBOL_STUBS |
861 MachO::S_ATTR_PURE_INSTRUCTIONS,
862 32, SectionKind::getText()));
863 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
864 OutStreamer.SwitchSection(
865 OutContext.getMachOSection("__TEXT","__symbol_stub1",
866 MachO::S_SYMBOL_STUBS |
867 MachO::S_ATTR_PURE_INSTRUCTIONS,
868 16, SectionKind::getText()));
870 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
873 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
874 // Remove $stub suffix, add $lazy_ptr.
875 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
876 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
879 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
880 // Add $tmp suffix to $stub, yielding $stub$tmp.
881 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
884 void PPCDarwinAsmPrinter::
885 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
886 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
887 bool isDarwin = Subtarget.isDarwin();
889 const TargetLoweringObjectFileMachO &TLOFMacho =
890 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
892 // .lazy_symbol_pointer
893 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
895 // Output stubs for dynamically-linked functions
896 if (TM.getRelocationModel() == Reloc::PIC_) {
897 const MCSection *StubSection =
898 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
899 MachO::S_SYMBOL_STUBS |
900 MachO::S_ATTR_PURE_INSTRUCTIONS,
901 32, SectionKind::getText());
902 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
903 OutStreamer.SwitchSection(StubSection);
906 MCSymbol *Stub = Stubs[i].first;
907 MCSymbol *RawSym = Stubs[i].second.getPointer();
908 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
909 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
911 OutStreamer.EmitLabel(Stub);
912 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
914 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
915 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
917 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
920 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
921 // bcl 20, 31, AnonSymbol
922 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
923 OutStreamer.EmitLabel(AnonSymbol);
925 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
926 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
927 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
928 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
933 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
935 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
936 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
937 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
938 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
940 .addExpr(SubLo16).addExpr(SubLo16)
943 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
945 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
947 OutStreamer.SwitchSection(LSPSection);
948 OutStreamer.EmitLabel(LazyPtr);
949 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
951 MCSymbol *DyldStubBindingHelper =
952 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
954 // .quad dyld_stub_binding_helper
955 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
957 // .long dyld_stub_binding_helper
958 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
961 OutStreamer.AddBlankLine();
965 const MCSection *StubSection =
966 OutContext.getMachOSection("__TEXT","__symbol_stub1",
967 MachO::S_SYMBOL_STUBS |
968 MachO::S_ATTR_PURE_INSTRUCTIONS,
969 16, SectionKind::getText());
970 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
971 MCSymbol *Stub = Stubs[i].first;
972 MCSymbol *RawSym = Stubs[i].second.getPointer();
973 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
974 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
976 OutStreamer.SwitchSection(StubSection);
978 OutStreamer.EmitLabel(Stub);
979 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
981 // lis r11, ha16(LazyPtr)
982 const MCExpr *LazyPtrHa16 =
983 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
984 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
986 .addExpr(LazyPtrHa16));
988 // ldu r12, lo16(LazyPtr)(r11)
989 // lwzu r12, lo16(LazyPtr)(r11)
990 const MCExpr *LazyPtrLo16 =
991 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
992 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
994 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
998 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1000 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1002 OutStreamer.SwitchSection(LSPSection);
1003 OutStreamer.EmitLabel(LazyPtr);
1004 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1006 MCSymbol *DyldStubBindingHelper =
1007 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1009 // .quad dyld_stub_binding_helper
1010 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1012 // .long dyld_stub_binding_helper
1013 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1017 OutStreamer.AddBlankLine();
1021 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1022 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1024 // Darwin/PPC always uses mach-o.
1025 const TargetLoweringObjectFileMachO &TLOFMacho =
1026 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1027 MachineModuleInfoMachO &MMIMacho =
1028 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1030 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1032 EmitFunctionStubs(Stubs);
1034 if (MAI->doesSupportExceptionHandling() && MMI) {
1035 // Add the (possibly multiple) personalities to the set of global values.
1036 // Only referenced functions get into the Personalities list.
1037 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1038 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1039 E = Personalities.end(); I != E; ++I) {
1041 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1042 MachineModuleInfoImpl::StubValueTy &StubSym =
1043 MMIMacho.getGVStubEntry(NLPSym);
1044 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1049 // Output stubs for dynamically-linked functions.
1050 Stubs = MMIMacho.GetGVStubList();
1052 // Output macho stubs for external and common global variables.
1053 if (!Stubs.empty()) {
1054 // Switch with ".non_lazy_symbol_pointer" directive.
1055 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1056 EmitAlignment(isPPC64 ? 3 : 2);
1058 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1060 OutStreamer.EmitLabel(Stubs[i].first);
1061 // .indirect_symbol _foo
1062 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1063 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1066 // External to current translation unit.
1067 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1069 // Internal to current translation unit.
1071 // When we place the LSDA into the TEXT section, the type info pointers
1072 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1073 // However, sometimes the types are local to the file. So we need to
1074 // fill in the value for the NLP in those cases.
1075 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1077 isPPC64 ? 8 : 4/*size*/);
1081 OutStreamer.AddBlankLine();
1084 Stubs = MMIMacho.GetHiddenGVStubList();
1085 if (!Stubs.empty()) {
1086 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1087 EmitAlignment(isPPC64 ? 3 : 2);
1089 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1091 OutStreamer.EmitLabel(Stubs[i].first);
1093 OutStreamer.EmitValue(MCSymbolRefExpr::
1094 Create(Stubs[i].second.getPointer(),
1096 isPPC64 ? 8 : 4/*size*/);
1100 OutStreamer.AddBlankLine();
1103 // Funny Darwin hack: This flag tells the linker that no global symbols
1104 // contain code that falls through to other global symbols (e.g. the obvious
1105 // implementation of multiple entry points). If this doesn't occur, the
1106 // linker can safely perform dead code stripping. Since LLVM never generates
1107 // code that does this, it is always safe to set.
1108 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1110 return AsmPrinter::doFinalization(M);
1113 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1114 /// for a MachineFunction to the given output stream, in a format that the
1115 /// Darwin assembler can deal with.
1117 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1118 MCStreamer &Streamer) {
1119 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1121 if (Subtarget->isDarwin())
1122 return new PPCDarwinAsmPrinter(tm, Streamer);
1123 return new PPCLinuxAsmPrinter(tm, Streamer);
1126 // Force static initialization.
1127 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1128 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1129 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1130 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);